Answers

It depends on the business requirements. e.g. It would be a good idea to activate the OWA feature on all site collection if you want to give your users some flexibility e.g. what if they are travelling or you add users in future who do not have Office client
installed etc. I would not say that OWA should only be used where users don't have full office client available. If I am simply reading documents I would prefer reading it browser rather than application. So it all depends.

As far as Installation and configuration is concerned, after running OWA setup you need to run SharePoint Configuration Wizard on each server in a SharePoint server farm. After that you need to start OWA service instances, and create the service applications
and service application proxy. Then you can activate the OWA feature at required Site Collection(s). If you have multiple site collection then you can use PowerShell to activate feature on multiple site collection. All new site collection will have feature
activated automatically.

All replies

It depends on the business requirements. e.g. It would be a good idea to activate the OWA feature on all site collection if you want to give your users some flexibility e.g. what if they are travelling or you add users in future who do not have Office client
installed etc. I would not say that OWA should only be used where users don't have full office client available. If I am simply reading documents I would prefer reading it browser rather than application. So it all depends.

As far as Installation and configuration is concerned, after running OWA setup you need to run SharePoint Configuration Wizard on each server in a SharePoint server farm. After that you need to start OWA service instances, and create the service applications
and service application proxy. Then you can activate the OWA feature at required Site Collection(s). If you have multiple site collection then you can use PowerShell to activate feature on multiple site collection. All new site collection will have feature
activated automatically.

Sure there will be limitation in functionality compared to Office client but most common functionality will be available in browser. If there are some advanced features are used in document which is only available through client then you will get message
about that.

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